The reference standard used for defining atomic mass is:

H - 1

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C - 12

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C - 13

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C - 14

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Solution

The correct option is B $C - 12$
Atomic mass is defined as a multiple of one-twelfth the mass of the carbon-12 atom.

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Why is isotope of carbon c-12 is used as standard unit for atomic mass and molecular mass

(N H_{2})_{2} C O

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